Effect Of Intermittent Solution Circulation On Tomato Growth And Yield In The Nutrient Film Technique

With the rapid development of facility agriculture,secondary salinization and soil sickness in greenhouse soil is increasingly serious.Nutrient Film Technique is a an important mode of soilless cultivation.It is one of the ways to solve the problem.The management of closed,environmentally friendly zero emissions and make full use of fertilizer and water.NFT cultivation process,people on the nutrient solution for the time of the system there is a different views.This experiment is using the tomato cultivar ‘shuang kang No.1' as experimental materials under greenhouse in Central Plains.It was cultivation bed under the ground level 20 cm,1hours for the cycle,intermittent solution circulation time and set up 6 levels,cultivation bed over the ground level was providing water for 40 minutes every 20 minutes as a comparison.The investigation of different processing tomato morphological indexes,yield and fruit quality,the absorption of mineral elements were determined,water,fertilizer and electric energy consumption calculation,root temperature was determined,studied the effects of intermittent solution circulation time on the growth and yield of tomato in NFT.The experimental results showed :1.With the extension of time for the Irrigation,the plant height of tomato showed a trend of increasing gradually;leaf area,fresh weigh,ratel of hotosynthesis,stomatal conductance,transpiration rate,fresh and dry weight of tomato in underground part by showing increased after decreased trend;but it was no effect on stem diameter and leaf number.2.With the extension of time for the irrigation,weight of single,excellent fruit rate and yield by showing decreased after increased trend,treatment C of weight of single(176.48g),excellent fruit rate(89.65%)and yield(7960.93 kg·667m-2)was best;it is not conducive to the increase of soluble sugar and dry matter accumulation in early fruit quality,it has little effect on other indexes(organic acid and VC content)of tomato.3.With the extension of time for the irrigation,is advantageous to the root of the absorption of potassium,average daily water consumption and fertilizer productivity showed a trend of increased after decreased;the trend of water productivity was notobvious.4.Intermittent solution for same time interval,compared with cultivation bed under the ground level,cultivation bed over the ground level treatment is has can effectively improve the rhizosphere temperature 1 ~ 2 ?,the excellent fruit rate increased by 11.75%,the yield increased by 9.48% and improve other biological indicators,such as plant height,stem diameter,leaf area,ratel of hotosynthesis and plant fresh and dry weight.It is more suitable for early spring tomato to cultivation bed over the ground level in Nutrient Film Technique cultivation.5.Cultivation bed under the ground level for same time interval,the highest yield was treatment B and C.But compared with treatment C,treatment B is has can save electricity 16.67%,save water by 9.13%,fertilizer productivity increased by3.78%,water productivity increased by 8.96%.It is more suitable for early spring tomato to an hour for Irrigation for 25 minutes in Nutrient Film Technique cultivation.